The element with highest first ionisation energy

What will come in place of ‘?’ in the following equation, if ‘+’ and ‘–‘ are interchanged and ‘×’ and ‘÷’ are interchanged?

Select the set in which the numbers are related in the same way as are the numbers of the following sets.

In the following series, which of the options will correctly fit into the gap

ZA5, Y4B, XC6, W3D, _____

A% B means 'A is the daughter of B'

A = B means 'A is the sister of B'

A $ B means 'A is the father of B'

If X% Y = Z% W $ V, then how is Z related to V?

Select the missing term from the given number series:

1, 2, ?, 10, 17, 26 ...

Which two numbers (not digits) should be interchanged to make the given equation correct?

116 - 92 ÷ 4 + 25 × 2 - 20 = 150 

Select the number from the given options to complete the series.

25, 30, 40, 55, 75, ___

Select the option that will fill in the blank and complete the given series correctly.

3, 9, 27, 81, 243, 729, ______

In a certain code language,

‘A + B’ means ‘A is the son of B’,

‘A – B’ means ‘A is the brother of B’,